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Step 3: Vehicle Size Graft

Source Tech Revolution pg. 78
Apply one of the following grafts based on the vehicle’s size category.

Medium

Source Tech Revolution pg. 78
Single-occupant and passenger vehicles of this size cater to Small users, such as goblins, halflings, and ysoki.
Adjustments: Decrease collision damage by 1 die, increase collision DC by 1. If the Piloting modifier is less than +0, increase it by 1.

Large

Source Tech Revolution pg. 78
This is the most common vehicle size.
Adjustments: No adjustments.

Huge

Source Tech Revolution pg. 78
Huge vehicles excel at moving sizable cargo and ferrying passengers.
Adjustments: Increase price by 10%, increase collision damage by 1 die, decrease collision DC by 1, decrease Piloting and attack modifiers by 1, increase passenger limit by 100%.

Gargantuan

Source Tech Revolution pg. 78
At this scale, vehicles tend to be built for mass transit or heavy freight hauling.
Adjustments: Increase price by 10%, increase Hit Points by 10%, increase collision damage by 2 dice, decrease collision DC by 2, decrease Piloting and attack modifiers by 1, increase passenger limit by 200%.

Colossal

Source Tech Revolution pg. 78
Only the most massive vehicles are colossal in scope, such as enormous trains and aircraft carriers.
Adjustments: Increase price by 20%, increase Hit Points by 20%, increase collision damage by 3 dice, decrease collision DC by 3, decrease Piloting and attack modifiers by 2, increase passenger limit by 400%.